Downdraft boiler-furnace



Patented Nov. I, I898. G. H. WAT-SON.

' DOWNDRAFT BOILER FURNACE.

(Application filed Feb. 28, 1898.

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Patented Nov. I, I898. G. H. WATSON.

DOWNDBAFT BOILER-FURNACE.-

(Apialication filed Feb. 28, 1898.)

3 Sheets-Sheet 2.

(No Model.)

, 1w 45 M R QQQVQ IIIIIHII Ii No. 6I3,6l4. Patented Nov. l, I898.

G. H.-WATSON.

DOWNDBAFT BOILER FURNACE.

(Application filed Feb. 28. 1698.) (N0 Model.) 3 Sheets-Shoat 3.

UNITED STATES PATENT OF ICE.

GEORGE H. WVATSON, OF CHICAGO, ILLINOIS.

DOWNDRAFT BOILER-FURNACE.

SPECIFICATION forming part of Letters Patent No. 613,614, dated November1, 1898.

Application filed February 28, 1898. Serial No. 672,019. (No model.)

To all whom, it may concern:

Be it known that I, GEORGE H. WATSON, a citizen of the United States,residing at Ohicago, Illinois, have invented certain new and usefulImprovements in Downdraft Boiler- Furnaces, of which the following is aspecification.

This invention relates to downdraft steam boiler-furnaces; and itconsists in an improved arrangement of the pipes constituting thewater-grate and in a novel combination of the water-grate andcirculating-pipes with a sediment-collector located outside theboiler-setting.

The invention is illustrated in the accompanying drawings, in which-Figure 1 is a vertical longitudinal section of one form of my improveddowndraft boilerfurnace. Fig. 2 is a similar view of the in-' vention,showing a modified arrangement of the water-grate. Fig. 3 is atransverse sectional elevation of that form of the invention shown inFig. 1 wherein the pipes composing the water-grate are turned upward attheir rear ends and connected with a header that communicates with theboiler. Fig. 4 is a transverse sectional elevation of the furnace shownin Fig. 2 wherein the pipes of the water-grate are turned downward attheir rear ends and connected with a header that communicates with thecirculating pipes. Fig. 5 is a rear elevation of the furnace arrangementshown in Fig. 1. Fig. 6 is a rear elevation of the furnace shown in Fig.2.

In the drawings, A designates a horizontal fire-tube boiler, B thefurnace, and O a sediment collector or receptacle located outside andpreferably at the rear of the boiler-setting.

The water-grate consists of a number of pipes or tubes 1, that connectwith a header 2 at their front ends and with a header 3 at their rearends. As shown in Figs. 1 and 3, the rear header 3 may connect with thesides of the boiler through pipes 4 and 5 for delivering into the boilerhot water from the water-grate. The ends of the headers 2 and'3 arepreferably provided with caps or manhole-covers 6 to give access forcleaning.

In the construction shown in Fig. 1 the front header 2 connects by tubes7 with cir culating-pipes 8, that are extended rearward through thebridge-wall D and through the combustion-chamber of the furnace and rearfurnace-setting and beyond this communi cate with the sediment-collectorO, that receives cooled water through pipe 9, leading from the lowerrear part of the boiler. The sediment collector or receptacle 0 isprovided with suitable blow-off devices or connections of any well-knowncharacter, and its location outside the boiler-settin g makes it readilyaccessible at all times.

From the receptacle or collector O the circulation is through the pipes8 to the header 2, Figs. 1 and 3, thence through the tubes 1 of thewater-grate to the header 3, and thence through the pipes 4 and 5 intothe boiler, returning again to the receptacle 0 by way of the pipe 9,that leads from the rear lower part of the boiler.

It will be observed that in the construction shown in Fig. 1 the rearends of the watergrate pipes 1 are turned upward to connect with theheader 3, which in this case is close to the boiler-bottom. In front ofthese upturned rear ends of the pipes 1 there is placed a screen orbaffle 10, of tile or suitable refractory material, to prevent thepassage of flame and products of combustion directly rearward betweenthe said upturned rear pipe ends and to force the flame downward towardthe subgrate of the bridge-wall. The tile screen 10 maybe supported onrear portions of the pipes or tubes 1 and should be in close proximityto or in front of the header 3.

Instead of turning the rear ends of the water-grate pipes 1 upward theymay be turned downward, as shown in Figs. 2 and 4, and in this case thecirculating pipes 8 will connect with the rear header 3 instead of theforward header. The rear header 3 is now lowered onto the bridge-wall atabout the level of the subgrate 12 or somewhat below the same, ifdesired. The front header 2 will now connect with the boiler throughpipes 13 14, that may enter the boiler-bottom, as shown in Figs. 2 and4, or, as shown by dotted lines in Fig. 4, the pipes from the header 2may connect with the boiler near its top. When the rear ends of thewatergrate pipes 1 are thus turned downward, a tile screen 15, Fig. 2,will be ar ranged between the boiler-bottom and the rear portion of thewater-grate 1 to divert the flame and products of combustion downwardonto the subgrate 12 and thence between the downward turned rear ends ofthe pipes or tubes 1 and so rearward over the bridge-wall. Tile 16 issupported above the forward portion of the water-grate between theboiler and the furnace-front.

By either described arrangement of watergrate and its headers thecirculation is greatly promoted and there is a rapid and economicalgeneration of steam, resulting also in a large saving of fuel. Besidesthis, all the parts of the steam-generator are readily accessible forcleaning and repairs.

That I claim is- 1. In a downdraft-furnace, the combination with aboiler, of a water-grate composed of pipes or tubes havingdownward-turned rear ends, a header connected with the saiddownward-turned rear ends of said pipes, circulating-pipes communicatingwith said header, a refractory screen or wall between the boiler and therear portion of the watergrate to divert the draft downward and rearwardbetween the downturned rear ends of the pipes composing the grate, and aheader through which the water-grate communicates with the boiler,substantially as described.

2. In a downdraft-furnace, the combination with a boiler, of awater-grate composed of pipes or tubes having downward turned rear ends,a header connected with the said downward-turned rear ends of saidpipes, circulating-pipes communicating with said header, a refractoryscreen or wall between the boiler and the rear portion of the Watergrateto divert the draft downward and rear- Ward between the downturned rearends of the pipes composing the grate, a header through which thewater-grate communicates with the boiler, a sediment-collector in rearof the boiler-setting, circulating-pipes extended through the furnaceand connecting with the water-grate and sediment-collector, and a pipeconnecting with the sediment-collector and boiler, substantially asdescribed.

I In testimony whereof I affix my signature in presence of twowitnesses.

GEORGE II. WATSON.

Witnesses:

HENRY E. COOPER, WALTER DONALDSON.

